Siren electric circuit HELP!!

So, sunday i put in an aftermarket bulldog keyless. while my truck had another one in it when i bought the truck, brand unknown, but when removing it, it had the alarm features with a siren, and im wanting to use the valet switch to make the siren into a new toy, the siren has two wires, a red and a black (hot and ground) and the valet switch has two wires, a red and black (hot and ground) then i gotta bring in power, i want this to be like an external horn that has power all the time and will work when the button is pressed, now i need to know what to do with bringin power to the ciruit and what should be hooked up where....